Question

The Doppler effect changes the

A) Frequency due to motion

B) Speed of sound due to motion

C) Speed of light due to motion

D) Radar waves in a police car

Answer 1

A) Frequency due to motion

As you are moving toward the object that is making the sound the frequency is higher.  When you begin to move away the frequency lowers.

Answer 2

The best answer that I would would be B